小学生四则运算出题系统——计应193许颖然

一.计划

编写一个小学生四则运算出题程序

二.开发

1.需求分析

作为一名一年级小学生的家长,我希望制作一个出题软件,完成100以内的正整数的加减法题随机产生。以便减轻我的家庭负担。

2.生成设计文档

3.设计复审

4.代码规范

注意大小写,注意缩进,括号一定要配对,注意要分行。

5.具体设计

系统开始,随机产生10道加法或者减法,计算完成后,统计做了多少道题,正确率,以及用了多少时间,系统结束。

6.具体编码

import java.util.InputMismatchException;
import java.util.Random;
import java.util.Scanner;
import java.io.*;

public class Pratices {
public static void main(String[] args) {
  new Pratices().list_Pratices();
  }

  public int random_Num(int range) {
  return (int) (Math.random() * range);
  }
  public void list_Pratices() {
int right = 0;
int wrongtimes = 0;  
int num_1, num_2, temp;
  int type = random_Num(4);
  int score = 0;  
int count = 1;
System.out.println("请输入题目数量:");
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
  while (count <= n) {
  type = random_Num(2);
  num1 = random_Num(100); //100以内随机数
  num2 = random_Num(100); //100以内的随机数
  wrongtimes = 0;

  if (type == 0)
{
  System.out.print("(" + count + ") " + num1 + " + " + num2+ " = ");//加法
  }
else if(type == 1)
{
  if ((num1 < num2))
{
  temp = num1;
  num1 = num2;
  num2 = temp;
  }
  System.out.print("(" + count + ") " + num1 + " - " + num2+ " = ");//减法
  }
else if(type == 2)

  System.out.print("(" + count + ") " + num1 + " * " + num2+ " = ");//乘法
}
else if(type == 3)
{
if(num2!=0)
  System.out.print("(" + count + ") " + num1 + " / " + num2+ " = ");//除法
else
System.out.println("分母为零");
}

  int answer = this.getAnswer(count);
  boolean flag = check(num1, num2, type, answer, count);
  if (flag) {
  right++;
  System.out.println("回答正确");
  score += this.getScore(wrongtimes);
  } else {
  while (wrongtimes < 2) {
  wrongtimes++;
  System.out.println("回答错误 " + wrongtimes + " 次");
  answer = this.getAnswer(count);
  flag = check(num1, num2, type, answer, count);
  if (flag) {
  score += this.getScore(wrongtimes);
  right++;
  wrongtimes = 0;
  break;
  }
  }
  if (wrongtimes == 3)
  System.out.println("回答错误 ");
  else
  System.out.println("回答正确");
  }
  count++;
  }
  System.out.println("回答正确 : " + right);
  System.out.println("回答错误: " + (10 - right));
  System.out.println("获得分数: " + score);
  System.out.println(getDegree(score));
  }

  public boolean check(int num_1, int num_2, int type, int my_Answer,
  int count) {
  int answer = 0;
  if (type == 1) {
  answer = num_1 - num_2;
  } else if (type == 0) {
  answer = num_1 + num_2;
  }
  return my_Answer == answer;
  }
  public int getAnswer(int count) {
  int my_Answer = 0;
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  try {
  my_Answer = Integer.parseInt(br.readLine());
  } catch (IOException e) {
  e.printStackTrace();
  } catch (NumberFormatException e) {
  System.out.println("输入有误");
  return 0;
  } finally {
  if (count >= n && (br != null)) {//不会超出输入的n
  try {
  br.close();
  } catch (IOException e) {
  e.printStackTrace();
  }
  br = null;
  }
  }
  return my_Answer;
  }
  public int getScore(int wrongtimes) {
  if (wrongtimes == 0) {
  return 10;
  } else if (wrongtimes == 1) {
  return 7;
  } else if (wrongtimes == 2) {
  return 5;
  } else
  return 0;
  }

  public String getDegree(int score) {
  if (score > 90)
  return "SMART";
  else if (score > 80)
  return "GOOD";
  else if (score > 70)
  return "OK";
  else if (score > 60)
  return "PASS";
  else
  return "TRY AGAIN";
  }
  }

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